There's an unfair implication there, as YC does want to improve the world (while making great wealth along the way).

It'd be more to the point to say that it's a reminder than YC is part of an institution where a small class of people (investors and founders) routinely take home millions, while rank and file employees (even with employee #1, 2, 3...) get to only watch as the CEO and investors play with their Maclarens and spend their millions on whatever they're passionate about.